package com.iceframework.core.activiti.controller;

import java.io.ByteArrayInputStream;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.activiti.bpmn.converter.BpmnXMLConverter;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.editor.language.json.converter.BpmnJsonConverter;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.repository.Model;
import org.activiti.engine.repository.ModelQuery;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.iceframework.core.base.BaseController;
import com.iceframework.core.entity.Result;

@RestController
@RequestMapping("/service")
public class ActivitiController extends BaseController{

	protected Logger logger = LoggerFactory.getLogger(getClass());

	@Autowired
	RepositoryService repositoryService;

	/**
	 * 模型列表
	 */
	@RequestMapping(value = "list")
	public Result modelList(String modelName, Page<Model> page) {
		PageHelper.startPage(page.getPageNum(), page.getPageSize(), page.getOrderBy());
		ModelQuery query = repositoryService.createModelQuery();
		if(StringUtils.isNotEmpty(modelName)) {
			query.modelNameLike(modelName);
		}
		List<Model> list = query.list();
		PageInfo<Model> data = new PageInfo<Model>(list, page.getPageSize());
		return Result.success().add("data", data);
	}
	
	/**
	 * 模型列表
	 */
	@RequestMapping(value = "get")
	public Result get(@RequestParam("id")String id) {
		ModelQuery query = repositoryService.createModelQuery();
		query.modelId(id);
		Model model = query.singleResult();
		return Result.success().add("model", model);
	}

	/**
	 * 创建模型
	 */
	@SuppressWarnings("deprecation")
	@RequestMapping(value = "save", method = RequestMethod.POST)
	public Result create(String id,@RequestParam("name") String name, @RequestParam("key") String key,
			@RequestParam("description") String description, HttpServletRequest request, HttpServletResponse response) {
		try {
			ObjectMapper objectMapper = new ObjectMapper();
            ObjectNode editorNode = objectMapper.createObjectNode();
            editorNode.put("id", "canvas");
            editorNode.put("resourceId", "canvas");
            ObjectNode stencilSetNode = objectMapper.createObjectNode();
            stencilSetNode.put("namespace", "http://b3mn.org/stencilset/bpmn2.0#");
            editorNode.put("stencilset", stencilSetNode);
            Model modelData = null;
            if(StringUtils.isNotEmpty(id)) {
            	modelData = repositoryService.getModel(id);
            	modelData.setName(name);
            	modelData.setKey(key);
            }else {
            	modelData = repositoryService.newModel();
            	ObjectNode modelObjectNode = objectMapper.createObjectNode();
            	modelObjectNode.put(ModelDataJsonConstants.MODEL_REVISION, 1);
            	
            	modelObjectNode.put(ModelDataJsonConstants.MODEL_NAME, name);
            	description = StringUtils.defaultString(description);
            	modelObjectNode.put(ModelDataJsonConstants.MODEL_DESCRIPTION, description);
            	modelData.setMetaInfo(modelObjectNode.toString());
            	modelData.setName(name);
            	modelData.setKey(StringUtils.defaultString(key));
            }
            
            repositoryService.saveModel(modelData);
            repositoryService.addModelEditorSource(modelData.getId(), editorNode.toString().getBytes("utf-8"));
			return Result.saveSuccess();
		} catch (Exception e) {
			logger.error("创建模型失败：", e);
			return Result.saveFail().setMsg(e.getMessage());
		}
	}

	/**
	 * 根据Model部署流程
	 */
	@RequestMapping(value = "deploy/{modelId}")
	public Result deploy(@PathVariable("modelId") String modelId, RedirectAttributes redirectAttributes) {
		try {
			Model modelData = repositoryService.getModel(modelId);
			ObjectNode modelNode = (ObjectNode) new ObjectMapper()
					.readTree(repositoryService.getModelEditorSource(modelData.getId()));
			byte[] bpmnBytes = null;

			BpmnModel model = new BpmnJsonConverter().convertToBpmnModel(modelNode);
			bpmnBytes = new BpmnXMLConverter().convertToXML(model);

			String processName = modelData.getName() + ".bpmn20.xml";
			Deployment deployment = repositoryService.createDeployment().name(modelData.getName())
					.addString(processName, new String(bpmnBytes)).deploy();
			modelData.setDeploymentId(deployment.getId());
			repositoryService.saveModel(modelData);
			redirectAttributes.addFlashAttribute("message", "部署成功，部署ID=" + deployment.getId());
		} catch (Exception e) {
			logger.error("根据模型部署流程失败：modelId={}", modelId, e);
			return Result.success().setMsg("部署失败"+e.getMessage());
		}
		return Result.success().setMsg("部署成功");
	}

	/**
	 * 导出model的xml文件
	 */
	@RequestMapping(value = "export/{modelId}")
	public void export(@PathVariable("modelId") String modelId, HttpServletResponse response) {
		try {
			Model modelData = repositoryService.getModel(modelId);
			BpmnJsonConverter jsonConverter = new BpmnJsonConverter();
			JsonNode editorNode = new ObjectMapper()
					.readTree(repositoryService.getModelEditorSource(modelData.getId()));
			BpmnModel bpmnModel = jsonConverter.convertToBpmnModel(editorNode);
			BpmnXMLConverter xmlConverter = new BpmnXMLConverter();
			byte[] bpmnBytes = xmlConverter.convertToXML(bpmnModel);

			ByteArrayInputStream in = new ByteArrayInputStream(bpmnBytes);
			IOUtils.copy(in, response.getOutputStream());
			String filename = modelData.getKey()+"["+ modelData.getVersion()+"]"+ ".bpmn20.xml";
			response.setHeader("Content-Disposition", "attachment; filename=" + filename);
			response.flushBuffer();
		} catch (Exception e) {
			logger.error("导出model的xml文件失败：modelId={}", modelId, e);
		}
	}

	@RequestMapping(value = "delete/{modelId}")
	public Result delete(@PathVariable("modelId") String modelId) {
		try {
			repositoryService.deleteModel(modelId);
			return Result.delSuccess();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			return Result.delFail().setMsg(e.getMessage());
		}
	}
}
